package com.ctl.config;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.scheduling.annotation.EnableAsync;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;

import java.util.concurrent.ThreadPoolExecutor;

@EnableAsync
@Configuration
public class ExecutorConfig {

    private static final Logger logger = LoggerFactory.getLogger(ExecutorConfig.class);

    @Value("${async.executor.thread.core_pool_size:9}")
    private int corePoolSize;
    @Value("${async.executor.thread.max_pool_size:100}")
    private int maxPoolSize;
    @Value("${async.executor.thread.queue_capacity:10}")
    private int queueCapacity;
    @Value("${async.executor.thread.name.prefix:nettyserver}")
    private String namePrefix;

    //参数初始化
    //private static final int CPU_COUNT = Runtime.getRuntime().availableProcessors();
    //核心线程数量大小
    //private static final int corePoolSize = Math.max(2, Math.min(CPU_COUNT - 1, 4));
    //线程池最大容纳线程数
    //private static final int maximumPoolSize = CPU_COUNT * 2 + 1;
    @Bean(name = "serviceExecutor")
    public ThreadPoolTaskExecutor asyncServiceExecutor() {
        logger.info("start asyncServiceExecutor");
        ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
        //配置核心线程数
        executor.setCorePoolSize(corePoolSize);
        //配置最大线程数
        executor.setMaxPoolSize(maxPoolSize);
        //配置队列大小
        executor.setQueueCapacity(queueCapacity);
        //配置线程池中的线程的名称前缀
        executor.setThreadNamePrefix(namePrefix);
        executor.setKeepAliveSeconds(300);
        executor.setAllowCoreThreadTimeOut(true);
        //executor.setThreadPriority(10);

        // rejection-policy：当pool已经达到max size的时候，如何处理新任务
        // CALLER_RUNS：不在新线程中执行任务，而是有调用者所在的线程来执行
        executor.setRejectedExecutionHandler(new ThreadPoolExecutor.DiscardOldestPolicy());
        //执行初始化
        executor.initialize();
        return executor;
    }
}